Controller
public class UpandDownController {
@RequestMapping("/testDown")
public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException {
//获取ServletContext对象
ServletContext servletContext = session.getServletContext();
//获取服务器中文件的真实路径
String realPath = servletContext.getRealPath("/static/img/xmj.png");
//创建输入流
InputStream is = new FileInputStream(realPath);
//创建字节数组
byte[] bytes = new byte[is.available()];
//将流读到字节数组中
is.read(bytes);
//创建HttpHeaders对象设置响应头信息
MultiValueMap<String, String> headers = new HttpHeaders();
//设置要下载方式以及下载文件的名字
headers.add("Content-Disposition", "attachment;filename=1.jpg");
//设置响应状态码
HttpStatus statusCode = HttpStatus.OK;
//创建ResponseEntity对象
ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes, headers, statusCode);
//关闭输入流
is.close();
return responseEntity;
}
@RequestMapping("/testUp")
public String testUp(MultipartFile uploadpic, HttpSession session) throws IOException {
// Get upload file name
String filename= uploadpic.getOriginalFilename();
System.out.println(filename);
// Resolve same filename issue
String subName = filename.substring(filename.lastIndexOf("."));
filename = UUID.randomUUID().toString().replaceAll("-","") + subName;
//Get file root from server path
ServletContext servletContext = session.getServletContext();
String picturePath = servletContext.getRealPath("picture");
File filePic = new File(picturePath);
if (!filePic.exists()){
filePic.mkdir();
}
String finalPath = picturePath + File.separator+filename;
// Implementing the upload function
uploadpic.transferTo(new File((finalPath)));
return "success";
}
}
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org" >
<head>
<meta charset="UTF-8">
<title>File Upload and Download</title>
</head>
<body>
<a th:href="@{/testDown}">Download Picture</a> <br>
<hr>
<form th:action="@{/testUp}" method="post" enctype="multipart/form-data">
Head icon <input type="file" name="uploadpic"> <br>
<input type="submit" value="Upload-picture">
</form>
</body>
</html>
<!--Configure upload file -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>
